| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.rng.examples.stress; |
| |
| import picocli.CommandLine.IVersionProvider; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.URL; |
| import java.util.Enumeration; |
| import java.util.jar.Attributes; |
| import java.util.jar.Manifest; |
| |
| /** |
| * {@link IVersionProvider} implementation that returns version information from |
| * the package jar file's {@code /META-INF/MANIFEST.MF} file. |
| * |
| * @see <a |
| * href="https://github.com/remkop/picocli/blob/master/picocli-examples/src/main/java/picocli/examples/VersionProviderDemo2.java">PicoCLI |
| * version provider demo</a> |
| */ |
| class ManifestVersionProvider implements IVersionProvider { |
| /** {@inheritDoc} */ |
| @Override |
| public String[] getVersion() throws Exception { |
| final Enumeration<URL> resources = Thread.currentThread().getContextClassLoader() |
| .getResources("META-INF/MANIFEST.MF"); |
| while (resources.hasMoreElements()) { |
| final URL url = resources.nextElement(); |
| try (InputStream stream = url.openStream()) { |
| final Manifest manifest = new Manifest(stream); |
| if (isApplicableManifest(manifest)) { |
| final Attributes attr = manifest.getMainAttributes(); |
| return new String[] {get(attr, "Implementation-Title") + " version \"" + |
| get(attr, "Implementation-Version") + "\""}; |
| } |
| } catch (final IOException ex) { |
| return new String[] {"Unable to read from " + url + ". " + ex}; |
| } |
| } |
| return new String[0]; |
| } |
| |
| /** |
| * Checks if this is the applicable manifest for the package. |
| * |
| * @param manifest The manifest. |
| * @return true if is the applicable manifest |
| */ |
| private static boolean isApplicableManifest(Manifest manifest) { |
| final Attributes attributes = manifest.getMainAttributes(); |
| return "org.apache.commons.rng.examples.stress".equals(get(attributes, "Automatic-Module-Name")); |
| } |
| |
| /** |
| * Gets the named object from the attributes using the key. |
| * |
| * @param attributes The attributes. |
| * @param key The key. |
| * @return the object |
| */ |
| private static Object get(Attributes attributes, String key) { |
| return attributes.get(new Attributes.Name(key)); |
| } |
| } |